Persepolis

Persepolis was the residence of Darius I (558-486 B.C).
At No Ruz (Persian New Year) the king held a yearly audience
where representatives of all the 28 vassal states appeared in
procession to offer gifts to His Majesty.
We can see that procession in beautifully detailed carvings on both
sides of the staircase that leads to the Apadana (reception hall).

The palace was burnt down by Alexander the Great (locally called
Alexander from Macedonia) 330 B.C in an attempt to destroy Persepolis,
but the remainders are still very impressive.